Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario descargar pdf (Pagina 563)

100

101

Surface Grinding Fixed Cycles

Chapter 16

16-13

D - number of auto-dress executions.

The number entered here (any integer from 0 to 999) indicates how many

times the dress program (P) is executed over the duration of the grinding

cycle. The way these dress operations are distributed throughout the cycle

varies , depending on the particular cycle. In general, the dress operations

occur immediately after a plunge move at reciprocation reversal points.

This parameter is not

“program modal.” If a value for the number of dress

executions is not programmed, then the dress program P is not executed

for that cycle. This does not affect pre-dress requests or operator requested

dressing as described in chapter 21.

The format for the G81 reciprocation mode is as follows:

G81Z__K__E__P__;

G81Y__J__E__P__;

G81X__I__E__P__;

Table 16.A summarizes the G81 mode parameters. For a detailed

description of these parameters, see the text below and page 16-8.

Table 16.A

G81 Mode Parameters

Parameter: Definition: Default Value: Possible Value:

Programmed axis

reciprocationprimaryreversalpoint from last cycle programmed abs. or inc.

Reciprocation axis integrand

reciprocationsecondaryreversal point from last cycle programmed abs.or inc.

reciprocationfeedrate from last cycle or last F valid F word

3 forG81 2 forG81.1

dressprogramnumber from last cycle programmed valid programnumber

mustbe programmed

musthave been programmed i n some previousblock if omitted

optional

Programming a G81 or G81.1 causes the control to execute a grinding

reci procation without a coordinated pick or plunge motion. The G81. 1

begins with a pre-dress operation prior to the reciprocation move.

Reciprocation m otion is described on page 16-4 of this chapter.

This reciprocation move is executed on whichever axis is programmed in

the G81 block, regardless of the active plane. The value entered with the

axis programmed defines the primary reversal point for the reciprocating

axis. It is entered as either a distance from the start point (G91) or as an

absolute position (G90). The integrand for the axis programmed defines

the secondary reversal point, either as a distance from the start point (G91)

or as an absolute position (G90).

16.3

G81 or G81.1 Reciprocation

Without Cross Pick or

Plunge

1 2 ... 558 559 560 561 562 563 564 565 566 567 568 ... 819 820

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